Finding the Fourth Proportional to 158,109.71, 218,196.61 and 86,488.10

Step by Step Solution

1. Step 1: Write the proportion equation
   158,109.71 : 218,196.61 = 86,488.10 : x
2. Step 2: Convert to fraction form
   158,109.71/218,196.61 = 86,488.10/x
3. Step 3: Cross multiply
   158,109.71x = 218,196.61 × 86,488.10
4. Step 4: Simplify right side
   158,109.71x = 18,871,408,918.14
5. Step 5: Solve for x
   x = 18,871,408,918.14/158,109.71
6. Step 6: Final answer
   x = 119,356.42